Revert "CHECK_LEAKS is always enabled with 01459f1"

* This reverts commit cf8fb9429511068c69ce70da7f7818c7441c280b.
* CHECK_LEAKS is no longer always enabled.

.github/workflows/annocheck.yml

@@ -104,6 +104,8 @@ jobs:
 
       ### test-spec doesn't work: https://github.com/ruby/ruby/actions/runs/4340193212/jobs/7578505652
       # - run: make test-spec
+      #   env:
+      #     CHECK_LEAKS: true
 
       - run: make test-annocheck
 

.github/workflows/compilers.yml

@@ -276,6 +276,8 @@ jobs:
         if: ${{ matrix.entry.check }}
 
       - run: make test-spec
+        env:
+          CHECK_LEAKS: true
         if: ${{ matrix.entry.check }}
 
       - run: make test-annocheck

.github/workflows/spec_guards.yml

@@ -54,6 +54,8 @@ jobs:
 
       - run: ruby ../mspec/bin/mspec
         working-directory: spec/ruby
+        env:
+          CHECK_LEAKS: true
 
       - uses: ./.github/actions/slack
         with: